adds hydrogen, ice, and combustion thrusters!

code/__DEFINES/atmospherics.dm

@@ -210,8 +210,10 @@
 #define ATMOS_TANK_PLASMA "plasma=70000;TEMP=293.15"
 #define ATMOS_TANK_O2 "o2=100000;TEMP=293.15"
 #define ATMOS_TANK_N2 "n2=100000;TEMP=293.15"
+#define ATMOS_TANK_HYDROGEN "h2=100000;TEMP=293.15"
 #define ATMOS_TANK_AIRMIX "o2=2644;n2=10580;TEMP=293.15"
 #define ATMOS_TANK_FUEL "o2=33000;plasma=66000;TEMP=293.15"
+#define ATMOS_TANK_HYDROGEN_FUEL "o2=33000;h2=66000;TEMP=293.15"
 
 //PLANETARY
 /// what pressure you have to be under to increase the effect of equipment meant for lavaland
@@ -324,6 +326,7 @@
 #define GAS_STIMULUM "stim"
 #define GAS_PLUOXIUM "pluox"
 #define GAS_FREON "freon"
+#define GAS_HYDROGEN "h2"
 
 #define GAS_FLAG_DANGEROUS (1<<0)
 #define GAS_FLAG_BREATH_PROC (1<<1)

code/game/machinery/outpost_electrolyzer.dm

@@ -0,0 +1,145 @@
+//allows production of hydrogen from ice chunks
+#define MOLS_PER_ICE 50
+
+/obj/machinery/mineral/electrolyzer_unloader
+	name = "ice unloading machine"
+	icon = 'icons/obj/machines/mining_machines.dmi'
+	icon_state = "unloader"
+	density = TRUE
+	input_dir = WEST
+	output_dir = EAST
+	needs_item_input = TRUE
+	processing_flags = START_PROCESSING_MANUALLY
+
+/obj/machinery/mineral/electrolyzer_unloader/pickup_item(datum/source, atom/movable/target, atom/oldLoc)
+	if(istype(target, /obj/structure/ore_box))
+		var/obj/structure/ore_box/box = target
+		for(var/obj/item/stack/ore/ice/chunk in box)
+			unload_mineral(chunk)
+	else if(istype(target, /obj/item/stack/ore/ice))
+		var/obj/item/stack/ore/chunk = target
+		unload_mineral(chunk)
+
+/obj/machinery/mineral/electrolyzer
+	name = "ice crusher"
+	desc = "breaks down ice into hydrogen and oxygen."
+	icon = 'icons/obj/recycling.dmi'
+	icon_state = "grinder-o1"
+	input_dir = WEST
+	density = TRUE
+	use_power = IDLE_POWER_USE
+	idle_power_usage = 50
+	active_power_usage = 1000
+	max_integrity = 500
+	var/crush_damage = 1000
+	var/datum/weakref/attached_output
+
+/obj/machinery/mineral/electrolyzer/Initialize()
+	. = ..()
+	update_appearance()
+	var/static/list/loc_connections = list(
+		COMSIG_ATOM_ENTERED = PROC_REF(on_entered),
+	)
+	AddElement(/datum/element/connect_loc, loc_connections)
+
+/obj/machinery/mineral/electrolyzer/CanAllowThrough(atom/movable/mover, border_dir)
+	. = ..()
+	if(!anchored)
+		return
+	if(border_dir == input_dir)
+		return TRUE
+
+/obj/machinery/mineral/electrolyzer/proc/on_entered(datum/source, atom/movable/AM)
+	SIGNAL_HANDLER
+	set_electrolyzer_output()
+	INVOKE_ASYNC(src, PROC_REF(electrolyze), AM)
+
+
+/obj/machinery/mineral/electrolyzer/proc/electrolyze(atom/movable/electrolyze_target, sound=TRUE)
+	if(machine_stat & (BROKEN|NOPOWER))
+		return
+	if(!isturf(electrolyze_target.loc))
+		return
+	if(istype(electrolyze_target, /obj/effect))
+		return	//effects are not touchable
+
+	var/list/to_electrolyze = electrolyze_target.GetAllContents()
+
+	var/list/electrolyze = list()
+
+	var/not_electrolyzed //used to play sounds if something that isnt ice gets chucked in
+
+	var/obj/machinery/atmospherics/components/binary/electrolyzer_out/resolved_output = attached_output?.resolve()
+
+	if(!resolved_output)
+		return
+	for(var/atom/movable/target as anything in to_electrolyze)
+		if(istype(target, /obj/item/stack/ore/ice))
+			electrolyze += target
+			continue
+		not_electrolyzed = TRUE
+		if(isliving(target))
+			crush_living(target)
+	if(not_electrolyzed)
+		playsound(src, 'sound/machines/buzz-sigh.ogg', 50, FALSE, 1) // Dont play a ton of sounds for a ton of items
+	for(var/electro in electrolyze)
+		resolved_output.electrolyze_item(electro)
+
+	if(!ismob(electrolyze_target)) //MULCH IT IF IT AINT ICE
+		qdel(electrolyze_target)
+
+
+/obj/machinery/mineral/electrolyzer/proc/set_electrolyzer_output()
+	for(var/direction in GLOB.cardinals)
+		for(var/obj/machinery/atmospherics/components/binary/electrolyzer_out/found in get_step(get_turf(src), direction))
+			attached_output = WEAKREF(found)
+			update_icon_state()
+			return TRUE
+
+/obj/machinery/mineral/electrolyzer/proc/crush_living(mob/living/L)
+
+	L.forceMove(loc)
+
+	if(issilicon(L))
+		playsound(src, 'sound/items/welder.ogg', 50, TRUE)
+	else
+		playsound(src, 'sound/effects/splat.ogg', 50, TRUE)
+
+	if(iscarbon(L))
+		if(L.stat == CONSCIOUS)
+			L.say("YOUWCH!!!!", forced="recycler grinding")
+
+	// Instantly lie down, also go unconscious from the pain, before you die.
+	L.Unconscious(100)
+	L.adjustBruteLoss(crush_damage)
+
+/obj/machinery/atmospherics/components/binary/electrolyzer_out
+	name = "electrolyzing chamber"
+	desc = "breaks down ice into hydrogen and oxygen."
+	icon = 'icons/obj/shuttle.dmi'
+	icon_state = "heater_pipe"
+
+	use_power = IDLE_POWER_USE
+	idle_power_usage = 50
+	active_power_usage = 1000
+
+	density = TRUE
+	max_integrity = 400
+	armor = list("melee" = 0, "bullet" = 0, "laser" = 0, "energy" = 100, "bomb" = 0, "bio" = 100, "rad" = 100, "fire" = 100, "acid" = 30)
+	layer = OBJ_LAYER
+	showpipe = TRUE
+	pipe_flags = PIPING_ONE_PER_TURF | PIPING_DEFAULT_LAYER_ONLY
+
+/obj/machinery/atmospherics/components/binary/electrolyzer_out/process_atmos()
+	update_parents()
+
+/obj/machinery/atmospherics/components/binary/electrolyzer_out/proc/electrolyze_item(obj/item/I)
+	var/datum/gas_mixture/air1 = airs[1] //hydrogen out
+	var/datum/gas_mixture/air2 = airs[2] //oxygen out
+	var/obj/item/stack/ore/ice/S = I
+	var/molestomake = S.get_amount()
+	air1.adjust_moles (GAS_HYDROGEN, molestomake)
+	air1.set_temperature (T20C) //sets temp, otherwise the gas spawns at lowest possible temp
+	air2.adjust_moles (GAS_O2, molestomake / 2)
+	air2.set_temperature (T20C)
+	update_parents()

code/game/machinery/shuttle/shuttle_engine_types.dm

@@ -101,6 +101,88 @@
 	thrust = 15
 	//All fuel code already handled
 
+/**
+ * ### Combustion/Fire engines
+ * Engines that use oxidizer and fuel to output thrust. Theoretically works with any mix of fuels and oxiders. Wish me luck.
+*/
+
+/obj/item/paper/guides/recycler
+	name = "paper - 'combustion thruster instructions'"
+	default_raw_text = "<h2>Combustion Thruster Instructions</h2> text <b>bold</b>"
+
+/obj/machinery/power/shuttle/engine/fire
+	name = "combustion thruster"
+	desc = "A thruster that burns fuel with oxider that is stored in an adjacent heater."
+	icon_state = "burst_plasma"
+	icon_state_off = "burst_plasma_off"
+	circuit = /obj/item/circuitboard/machine/shuttle/engine/fire
+
+	idle_power_usage = 0
+	///what portion of the mols in the attached heater to "burn"
+	var/fuel_consumption = 0.0125
+	//multiplier for thrust
+	thrust = 3
+	//used by stockparts, efficiency_multiplier
+	var/consumption_multiplier = 1
+	//If this engine should create heat when burned.
+	var/heat_creation = FALSE
+	//A weakref of the connected engine heater with fuel.
+	var/datum/weakref/attached_heater
+
+
+/obj/machinery/power/shuttle/engine/fire/burn_engine(percentage = 100, deltatime)
+	..()
+	var/obj/machinery/atmospherics/components/unary/shuttle/fire_heater/resolved_heater = attached_heater?.resolve()
+	if(!resolved_heater)
+		return
+	if(heat_creation)
+		heat_engine()
+	var/actual_consumption = fuel_consumption * (percentage / 100) * deltatime * consumption_multiplier
+	return resolved_heater.consume_fuel(actual_consumption) * thrust //this proc returns the min of the fuel/oxy possible burns, multiply by our thrust value
+
+/obj/machinery/power/shuttle/engine/fire/return_fuel()
+	. = ..()
+	var/obj/machinery/atmospherics/components/unary/shuttle/fire_heater/resolved_heater = attached_heater?.resolve()
+	return resolved_heater?.return_gas()
+
+/obj/machinery/power/shuttle/engine/fire/return_fuel_cap()
+	. = ..()
+	var/obj/machinery/atmospherics/components/unary/shuttle/fire_heater/resolved_heater = attached_heater?.resolve()
+	return resolved_heater?.return_gas_capacity()
+
+/obj/machinery/power/shuttle/engine/fire/screwdriver_act(mob/living/user, obj/item/I)
+	. = ..()
+	if(!panel_open)
+		update_icon_state()
+
+/obj/machinery/power/shuttle/engine/fire/update_engine()
+	. = ..()
+	if(!.)
+		return
+	if(!attached_heater)
+		if(!set_heater())
+			thruster_active = FALSE
+			return FALSE
+
+/obj/machinery/power/shuttle/engine/fire/proc/set_heater()
+	for(var/direction in GLOB.cardinals)
+		for(var/obj/machinery/atmospherics/components/unary/shuttle/fire_heater/found in get_step(get_turf(src), direction))
+			if(found.dir != dir)
+				continue
+			if(found.panel_open)
+				continue
+			if(!found.anchored)
+				continue
+			attached_heater = WEAKREF(found)
+			update_icon_state()
+			return TRUE
+
+/obj/machinery/power/shuttle/engine/fire/RefreshParts()
+	var/laz = 0
+	for(var/obj/item/stock_parts/micro_laser/L in component_parts)
+		laz += L.rating
+	consumption_multiplier = laz
+	return
 /**
  * ### Ion Engines
  * Engines that convert electricity to thrust. Yes, I know that's not how it works, it needs a propellant, but this is a video game.